题解 | #求解立方根暴力遍历！！还有谁？？？

num_float=float(input())
num_1f=0.1
num_2f=-0.1
error=0
while 1:
    if num_float==0.0:
        print('0.0')
    elif num_float>0:
        error=num_float-num_1f**3
        if num_float-num_1f**3<0:
            if num_1f**3-num_float > num_float-(num_1f-0.1)**3:
                num_1f=num_1f-0.1
            print(round(num_1f,1))
            break    
        else:
            num_1f+=0.1
    elif num_float<0:
        if num_float-num_2f**3>0:
            if  num_float-num_2f**3 > (num_2f+0.1)**3-num_float:
                num_2f=num_2f+0.1
            print(round(num_2f,1))
            break    
        else:
            num_2f-=0.1